I. Arslan et Ia. Balcioglu, Advanced oxidation of raw and biotreated textile industry wastewater with O-3, H2O2/UV-C and their sequential application, J CHEM TECH, 76(1), 2001, pp. 53-60
The advanced chemical oxidation of raw and biologically pretreated textile
wastewater by (1) ozonation, (2) H2O2/UV-C oxidation and (3) sequential app
lication of ozonation followed by H2O2/UV-C oxidation was investigated at t
he natural pH values (8 and 11) of the textile effluents for 1 h. Analysis
of the reduction in the pollution load was followed by total environmental
parameters such as TOC, GOD, UV-VIS absorption kinetics and the biodegradab
ility factor, f(B). The successive treatment combination, where a prelimina
ry ozonation step was carried out prior to H2O2/UV-C oxidation without chan
ging the total treatment time, enhanced the COD and TOC removal efficiency
of the H2O2/UV-C oxidation by a factor of 13 and 4, respectively, for the r
aw wastewater. In the case of biotreated textile effluent, a preliminary oz
onation step increased COD removal of the H2O2/UV-C treatment system from 1
5% to 62%, and TOC removal from 0% to 34%. However, the sequential process
did not appear to be more effective than applying a single ozonation step i
n terms of TOC abatement rates. Enhancement of the biodegradability factor
(fB) was more pronounced for the biologically pretreated wastewater with an
almost two-fold increase for the optimized Advanced Oxidation Technologies
(AOTs). For H2O2/UV-C oxidation of raw textile wastewater, apparent zero o
rder COD removal rate constants (k(app)), and the second order OH. formatio
n rates (r(i)) have been calculated. (C) 2001 Society of Chemical Industry.